Improvement in boring and squaring off cylinders



f L UNITED STATES PATENTOFFIOE;jg

JOHN C. CHAPMAN, OF CHARLESTOWN,MASSACHUSETTS IMPROVEMENT |N BORING AND'SQUARINGOFF OYLINDERS.

Specification forming part of Letters Patent No. 37,384, dated January 13, 1863. l

.To @ZZ whom it may concern:

Be it known that I, JOHN C. CHAPMAN, of Charlestown, in the county of Middlesex and State'of Massachusetts, have invented a new and improved. implement or device for boring cylinders and other articles and squaring orf-facing oft' the ends of the same and I do hereby declare that the following` is a full, clear, and exact description of the same, reference being had to the accompanying drawings, making a pa-rt of this specification, in which- Figure l is a longitudinal central section of my invention, taken in the lines x' a, Figs. 2 and 4 Fig. 2, an end or face view ofthe squaring-ott implement; Fig. 3, a transverse section of the same, taken in the line y y, Fig. l; Fig. 4, a transverse section of the boring implement, taken in the linee z, Fig. 1.

Similar letters of reference indicate correspending parts in the several gures.

v The object of this invention is to obtain an implement or device which may be applied to` an ordinary turning-lathe and made t0 operate in the way ot boring and squaring Or facing off the ends of metal cylinders or other articles kequally as well as the more pretentious and comparatively expensive machines which are now made for such purposes.

To enable those skilled in the art to fully understand and construct my invention, I will proceed to describe it.

A represents an arbor on which the implement is fitted. This arbor is placed in a lathe in the usual way, and it has a screw thread, a, upon it of a requisite length, on which a nut, B, is fitted. This nutis of circular form, and it has a groove, b, made in its periphery, into which a screw, c, iits, said screw passing through a ring, C, which encompasses the nut, and which is held stationary as the arborArotates, in con sequence ofa projection, D, on the ring being in contact with a rest or bearing, d, attached to the lathe. The nut B is allowed to turn freely within the ring Gr.

E is a cylindrical head or stock, which has cutters e e attached to it. These cutters are fitted in radial holes made in the head or stock, and are secured therein by set-screws f, as shown clearly in Fig. l. The head or stock is allowed to slide freely on the arbor A, and is made to turn with it, in consequence of having a projection, g, which tsin alongitudinal groove, h, in the arbor. (See Fig. 4.) At the end of the head or stock opposite to, thatl where the cutters are secured there 'is an lccf centric, F. The eccentric and header stock may be castI in one piece, and the former has a groove, z', made in its periphery, in whicha screw or pin ts that passes through a ring,

towed to turn freely Onthe eccentric, andthe former has a pin, 7c, projecting horizontally from it, on which a frictionroller, l, ,i s placed.

This friction-roller is titted'in'v afgroove or slot, m, made radially in the contiguousside of the nut B. In the periphery of the ring lGr there are inserted radially a number of pins, 72,',

which, in consequence of the eccentric F, are made to strike the projection D. When the arbor A is rotated in the lathe, the head or,

the cutter head or stock is produced rlby the nut B, ring G, pins n, screw a, arbor A, and eccentric F, the lathe at every revolution of the cutter-head causing a pin n to come in l contact 'with the projection D, and thereby ar-v resting the rotation of the ring Gand nut B'. This intermitting cessation of t-herotation of.'

the nut B produces 'the feed, for when the nut is stationary the screw in the arbor A will feed the cutter-head along. The extent.

of the feed movement at each revolution of the cutter-head will be in accordance with the number of pins n on ring G. It' eight pins be used, as shown in Fig. 4, there will be a feed movement equal to one-eighth of the pitch of the screw c, at each revolution of the arbor A. It' seven pins be used, there would be a feed movement equal to one-seventh of the pitch, and so on. lt will be understood, of course, that the ring C moves with the cutter head or stoel; E during its feed movement, as the former is connectedY with the nut B, and the projection D is allowed to slide along on the rest or bearing d.

The parts above described constitute the boring tool or implement. The squaring or facing oi' tool is but a simple modification of the boring-tool. In the former the cutter- G, which encompasses it. Thering Grisal.

head is formed of a cylinder, H, having a circular plate, I, at one end, with a dovetail projection, J, on the face ot' the latter. On this projection, J there are fitted two slides, K K,

each of which has a cutter, L, fitted to it.'

The slides K K have each a nut, M, attached to their inner sides, in which screws N N work, said screws both having left-hand threads. These screws N N are on one and the same shaft, O, and on said shaft there are placed two bevel-gears, PP, which gear into a toothed rim, Q, on a circular disk, It, which is fitted in a recess in the back of the circular plate I. The plate I has a radial guide, S, attached to it to receive a friction-roller, o, which is placed on a pin, q, that projects from a ring, T, the periphery of which is provided with pins r, like those of ring G in the tool first described. The ring T is fitted on an eccentric, U, which has a collar, V, attached to it, the latter being concentric with the cylinder H, and secured thereon by a set-screw, ax. The cylinder H is itted on the arbor A in precisely theA same way as the cylinder or cutter head E, and the ring T is `operated. by the eccentric U and la rest or bearing in the same way as the ring G. The ring T, however, acts upon the plate I, instead ofa nut, and the cessation ofthe rotary movement of this plate causes the gears P P To be turned, and consequently the screws N N, and the slides K K, to which the cutters are attached, are gradually fed outward, and the flange or end of a cylinder squared or faced oif at right angles to the cylinder. This latter modification, it will be seen, does not, while performing this work, require any feed movement on the arbor, the cutters L having the feed movement given them in a direction at right angles to the arbor, the cylinder or other article operated upon being stationary. This squaring or facing oft' tool may also be used as a boring-tool for boring holes of larger diameter than the one previously described by placing it on the arbor A in front of the cutter head or stock E, the latter feedin g the former along to its work.

Taper holes are bored with this invention by setting one end of the arbor A out of line with its center. This is effected as follows: The end of the arbor is fitted in a socket, W, (see Fig. 1,) which has a bar or plate, X, at its inner end. In this bar or plate X there is made longitudinally a' groove, s, in which a slide,Y, is fitted, and secured at any point by a bolt, t, which passes through a slot, u, in the slide, and a set-screw, Z,which passes through one end of the bar or plate X and bears against one end of the slide Y. The slide Y has a hole, o, made in it to receive the center point, and by adjusting the slide Y the center point, w, may be thrown more orlcss out ofline` with the axis of the cylinder or other article to be bored, and the taper hole thereby formed or bored.

Having thus described my invention, what I claim as new,'and desire to secure by Letters 1. The cylinder or cutter head or stock E," `with eccentric F attached, in combination Awith the ring G, placed on the eccentric and -having its periphery provided with pins n,

and the nut B, fitted within the ring C and connected with the ring G through the medium of the slot or groove m and roller l, the above parts being tted on the arbor A, as shown, and all arranged to operatel as and for the purpose herein set forth.

2. The cylinder H, with the eccentric U, having the ring T fit-ted on it, with pins W' attached, in combination with the plate I, provided with the toothed rim Q, the screw-shaft O, gears P P, and cutter-slides K K, all arrangedsubstantially as and for the purpose.

set forth.l

3. The socket W, when arranged with a` slide, Y, containing the hole e for the center JOHN C. CHAPMAN.

Witnesses: l

CHAs. ROBINSON, Jr., C. P. DAVIDSON. 

